- When you need to dump black and gray water or refill your fresh water tank in Howe, Oklahoma, you have several options.- The Pilot Flying J has a designated RV dump station that offers a hose for flushing tanks and a trash bin for waste disposal. - Springhill Park and Clear Creek Campground, both U.S. Army Corps of Engineers sites, offer dump stations with potable water available for a fee. - Park Ridge RV Campground also has an on-site dumping station available for guests to use.